Latest working kernel version: N/A
Distribution: Gentoo
Hardware Environment: Toshiba Satellite L300-214

Software Environment:
gcc version 4.3.4 (Gentoo 4.3.4 p1.1, pie-10.1.5)
Binutils 2.18-r3
Grub (GNU GRUB 0.97)
Architecture: x86_64

Description:
During the build of kernel 2.6.33.2, I receive a section mismatch warning. After
re-compiling with CONFIG_DEBUG_SECTION_MISMATCH=y, I get those 3 warnings:

  CC      drivers/pci/pci-acpi.o
  LD      drivers/pci/built-in.o
WARNING: drivers/pci/built-in.o(.text+0xf50d): Section mismatch in reference
from the function dmar_ir_support() to the variable .init.data:dmar_tbl
The function dmar_ir_support() references
the variable __initdata dmar_tbl.
This is often because dmar_ir_support lacks a __initdata 
annotation or the annotation of dmar_tbl is wrong.

  LD      drivers/usb/storage/usb-storage.o
  LD      drivers/usb/storage/built-in.o
  LD      drivers/usb/built-in.o
  LD      drivers/built-in.o
WARNING: drivers/built-in.o(.text+0xf50d): Section mismatch in reference from
the function dmar_ir_support() to the variable .init.data:dmar_tbl
The function dmar_ir_support() references
the variable __initdata dmar_tbl.
This is often because dmar_ir_support lacks a __initdata 
annotation or the annotation of dmar_tbl is wrong.

  LD      vmlinux.o
  MODPOST vmlinux.o
WARNING: vmlinux.o(.text+0x28e8d5): Section mismatch in reference from the
function dmar_ir_support() to the variable .init.data:dmar_tbl
The function dmar_ir_support() references
the variable __initdata dmar_tbl.
This is often because dmar_ir_support lacks a __initdata 
annotation or the annotation of dmar_tbl is wrong.

  GEN     .version

I did some googling and looks like there is a solution/workaround by modifying
dmar.c and intel-iommu.h as the attached url describes.